Quasiparticle bands in cuprates by quantum chemical methods: towards an ab initio description of strong electron correlations

Abstract

Realistic electronic-structure calculations for correlated Mott insulators are notoriously hard. Here we present an ab initio multiconfiguration scheme that adequately describes strong correlation effects involving Cu 3d and O 2p electrons in layered cuprates. In particular, the O 2p states giving rise to the Zhang-Rice band are explicitly considered. Renormalization effects due to nonlocal spin interactions are also treated consistently. We show that the dispersion of the lowest band observed in photoemission is reproduced with quantitative accuracy. Additionally, the evolution of the Fermi surface with doping follows directly from our ab initio data. Our results thus open a new avenue for the first-principles investigation of the electronic structure of correlated Mott insulators.

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• Spin-state transition and spin-polaron physics in cobalt oxide perovskites: ab initio approach based on quantum chemical methods
• Fermiology of Cuprates from First Principles: From Small Pockets to the Luttinger Fermi surface
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• Orbital breathing effects in the computation of x-ray d-ion spectra in solids by ab initio wave-function-based methods
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• Electron correlation effects in diamond: a wave-function quantum chemistry study of the quasiparticle band structure
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